class_docstr: This class implements a model-specific automatic speech recognizer using the end-to-end speech recognizer
  DeepSpeech and PyTorch. It supports both version 2 and version 3 of DeepSpeech models as released at
  https://github.com/SeanNaren/deepspeech.pytorch.
  
  | Paper link: https://arxiv.org/abs/1512.02595
docstr: Apply preprocessing and then transform the user input space into the model input space. This function is used
  by the ASR attack to attack into the PyTorchDeepSpeech estimator whose defences are called with the
  `_apply_preprocessing` function.
  
  :param x: Samples of shape (nb_samples, seq_length).
  :param y: Target values of shape (nb_samples). Each sample in `y` is a string and it may possess different
            lengths. A possible example of `y` could be: `y = np.array(['SIXTY ONE', 'HELLO'])`.
  :param real_lengths: Real lengths of original sequences.
  :return: A tuple of inputs and targets in the model space with the original index
           `(inputs, targets, input_percentages, target_sizes, batch_idx)`, where:
           - inputs: model inputs of shape (nb_samples, nb_frequencies, seq_length).
           - targets: ground truth targets of shape (sum over nb_samples of real seq_lengths).
           - input_percentages: percentages of real inputs in inputs.
           - target_sizes: list of real seq_lengths.
           - batch_idx: original index of inputs.
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code: def _preprocess_transform_model_input(
      self,
      x: "torch.Tensor",
      y: np.ndarray,
      real_lengths: np.ndarray,
  ) -> Tuple[
      "torch.Tensor",
      "torch.Tensor",
      "torch.Tensor",
      "torch.Tensor",
      List,
  ]:
      """
      Apply preprocessing and then transform the user input space into the model input space. This function is used
      by the ASR attack to attack into the PyTorchDeepSpeech estimator whose defences are called with the
      `_apply_preprocessing` function.
  
      :param x: Samples of shape (nb_samples, seq_length).
      :param y: Target values of shape (nb_samples). Each sample in `y` is a string and it may possess different
                lengths. A possible example of `y` could be: `y = np.array(['SIXTY ONE', 'HELLO'])`.
      :param real_lengths: Real lengths of original sequences.
      :return: A tuple of inputs and targets in the model space with the original index
               `(inputs, targets, input_percentages, target_sizes, batch_idx)`, where:
               - inputs: model inputs of shape (nb_samples, nb_frequencies, seq_length).
               - targets: ground truth targets of shape (sum over nb_samples of real seq_lengths).
               - input_percentages: percentages of real inputs in inputs.
               - target_sizes: list of real seq_lengths.
               - batch_idx: original index of inputs.
      """
      import torch
  
      # Apply preprocessing
      x_batch = []
      for i, _ in enumerate(x):
          preprocessed_x_i, _ = self._apply_preprocessing(
              x=x[i], y=None, no_grad=False
          )
          x_batch.append(preprocessed_x_i)
  
      x = torch.stack(x_batch)
  
      # Transform the input space
      (
          inputs,
          targets,
          input_rates,
          target_sizes,
          batch_idx,
      ) = self._transform_model_input(
          x=x,
          y=y,
          compute_gradient=False,
          tensor_input=True,
          real_lengths=real_lengths,
      )
  
      return inputs, targets, input_rates, target_sizes, batch_idx
  
imports: import logging
  from typing import TYPE_CHECKING, List, Optional, Tuple, Union
  from pkg_resources import packaging
  import numpy
  from art import config
  from art.estimators.pytorch import PyTorchEstimator
  from art.estimators.speech_recognition.speech_recognizer import SpeechRecognizerMixin, PytorchSpeechRecognizerMixin
  from art.utils import get_file
label_desc: Use image node_id 6 for calling the PyTorchDeepSpeech obj's underlying member method code with example usage: obj._preprocess_transform_model_input(x, y, real_lengths) and returns: inputs,  targets,  input_rates,  target_sizes,  batch_idx